Optical system



mummia w Dec. 12, -1933. l F.w.JoBE 1939554 OPTICAL SYSTEM Filed oct. 1'7 951 FIGB' 24 BY m MM .4 TTU/@NBV `Patented Dec. 12, 193

fdppiicaticn October i7,

This invention relates to rojection apparatus and more particularly it has reference to a device which is used for projecting-onto a screen,'images of a relatively long, -narrow object, .such as .a selected portion of a stock' ticker tape, for example;

In projecting news items or stock market prices froma'traveling tapefiit' is, of course, desirable that the projected image remain on the screen a suincient time so that it can be read conveniently and accurately by an observer. This can be accomplished by illuminating a relatively long portion of the tape and projecting its image onto a relatively long, narrow screen. In recent years, the speed of the ticker mechanism which feeds the tape has been increased so that it is necessary to project an image of a longer portion of tape on a longer screen while still preserving the magnification and duration of image on the screen that prevailed before the speed of the tape feeding mechanism had been increased. Great diilculty is experienced, however, when an attempt is made to provide a convenient means for uniformly illuminating a relatively long, narrow object, such as a selected portion of a ticker tape, for exampie.

One of the objects of my invention is to provide an improved optical system for eiciently illuminating a relatively long, narrow object. Another object is to provide a projection apparatus having means which can be adjusted and adapted for uniformly illuminating a relatively long, narrow object. A still further object is to provide a projection apparatus having an optical system whereby light rays from a relatively concentrated source may be utilized for uniformly illuminating a relatively long, narrow object. These and other advantages reside in certain novel features of construction, arrangement and combination of parts as will hereinafter be more fully described.

Referring to the drawing:

Fig. 1 is a schematic view of a projection apparatus embodying my invention.

Fig. 2 is a top plan View of the illuminating system or" the apparatus.

Fig, 3 is a Side View of one of the lens elements of the system.

A preferred embodiment of my invention is illustrated in the drawing wherein 10 indicates a light source, such as an incandescent lamp having a coiled iilament. A reilector 11 cooperates with the source 10 to send light rayS through the lens elements l2 and 13 and onto the inclined reflector' 14 from whence nthey are directed upwardly through the lens element 15 to illuminate the relatively long, narrow, transparent tape T bear- ,ssi

Frederick W. Jobe, Rochester, N. Y., assigner to Bausch &Lcrnb'0ptical Company, Rochester,

N'.' Y.; a corporation of New York 1.

1913.1.: @Essai ri-weil Sasser/i Y ing'printed indicia such as lettersorgures.: l

suitable projection lens 16 projects images of the indicia onto the screenxl?, the light-rays from the lens 16 being successively reflected'by the angularly disposed reilecto1's'.18'and,19. The path of light rays is shown broken in Figi 1' since in actual practice the screen 17 is positioned about /guto 8 feet above the projection lens 16.'

The lens element 12 has a cylindrical surfac 2 and a spherical surface 2l while the lens element 13 has a spherical surface 22 and a plano surface 23. As shown in Fig. 3, the lens element l5 has a lower cylindrical surface 24 and an upper pla-no surface 25, across which the tape T :is moved by the usual ticker mechanism, not shown. This combination and relation of lens surfaces makes it possible to illuminate, uniformly, the long, narrow tape. The cylindrical surface 2G serves to condense the light rays in one meridian and the cylindrical surface 24 condenses the rays in another meridian. With this arrangement of lens surfaces the adjustment is not critical and hence the system may be readily adjusted. rThis arrangement of lens surfaces further facilites the manufacture of the lenses.

In one embodiment of my invention, the surfaces 2o and 21 each have a radius of curvature of 163 millimeters, the surface 22 a radius of curvature of 249 millimeters and the surface 24 a radius of curvature of 136 millimeters. The top surface of lens element 15 is approximately 1.5 inches wide and 7.5 inches lonfT so that it is possible to uniformly illuminate and project data from a strip of tape which is approximately seven inches long.

From the foregoing it will be apparent that I am able to attain the objects oi my invention and provide an improved and eicient means for uniformly illuminating a relatively Aong, narrow object such as a selected portion of a traveling stock ticker tape. Although I have shown my invention as embodied in a device in which light rays from the source are reilected upwardly, it is," of course, obvious that my invention can be equally well applied to other forms of projecting or illuminating devices in which reilectors are not interposed in the path of rays between the source and the object. Various modiiications and adaptations of my invention can obviously be made by those skilled in the art without departing from the spirit of my invention as pointed out in the appended claims.

I claim:

l. An illuminating apparatus comprising a sht source, a condenser system for condensing light from said source onto a relatively long, narrow object, said system comprising three spaced lens elements, the lens elements adjacent to said source and said object each being provided with 5 a convex cylindrical surface, the element adjacent to said object having a substantially plano surface which faces the object. o 1 f 2. A projection apparatus having in combination a light source, a condenser system for condensing light from said source onto a'relatively long, narrow object Whose image is to be projected, said system comprising a plurality of lens elements, one of said elements being adjacent to said source and having a cylindrical surface and a spherical surface, the'radii of the curvature of said surfaces being substantially equal, another of said elements being positioned adjacent to the object and having cylindrical and plano surfaces with the plano surface :facing the object.

3. A projection 'apparatus comprising a light source, an inclined reector, an objective positioned 'above said reflector, a sphero-cylindrical lens anda planospherical lens positioned between said source and said reflector and a planocylindrical lens positioned between said reflector and said objective, saidvlenses' being arranged to direct light rays,'.from said source, onto a rela- 1,939,554 i i.' Q

tively long, narrow object whose image is projected by said objective.

4. A projection apparatus comprising a light source, lens means for illuminating a relatively long, narrow object, an objective for projecting an image of said object, said lens means comprising a Adouble convex lens positioned adjacent "to-said source, a plano-convex lens positioned adjacent to said object and a second plano-convex lens' positioned between said other two lenses,

Asaid double convex lens having a surface Whose radius of curvature is greater than that of the convex surface of said first-named plano-convex lens and less than that of the convex surface of said second plano-convex lens.

,A 5.y In a projection apparatus, the combination of a light source, av condensing lens system for condensing light from said source onto a relatively long'narrow object, said system comprising a sphere-cylindrical lens having its cylindrical surface facingsaid source, and. a planoecylindrical lens having itsplano. surface adjacent to. and facing the object, the axes ofthe cylindricalsur4 faces of said lenses beingpositioned, respectively, in-planes which arev substantially perpendiculatoeach other. r l" FRE'nERroKw. 'Lionel ,1;

CII 

